Mechanism for transmitting power.



F. 0. SMITH; MECHANISM FOR TRANSMITTING POWER. APPLICATION FILEDDEC-31.1915.

Patented Feb. 20, 1917.

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F. DpSMITH.

MECHANISM FOR TRANSMITTING POWER. APPLICATION men 05cm. 1915. 1,216,865.Patented Feb. 20,1917. 3 SHEETS-SHEET 2.

F. D. SMITH.

MECHANISM FOR TRANSMITTING POWER.

APPLICATION FILED 050.31. 1915.

Patented Feb. 20, 1917.

3 SHEETS-SHEET 3.

FRANKLIN D. SMITH, OF DEA DWO'OD, SOUTH DAKOTA.

' MECHANISM ro'a TRANSMITTING rowna.

Specification of Letters Patent.

Patented Feb. 2%, 1917.

Application filed December 31, 1915. Serial No. 69,586.

To all whom it may concern:

Be it known that I, FRANKLIN D. SMITH, a citizen of the United States,residing at Deadwood, in the county of Lawrence and State of SouthDakota, have invented certain new and useful Improvements in Mechanismfor Transmitting Power, of which the following is a specification.

This invention relates to mechanism for transmitting power from arotating member to a reciprocating member and has for its object theprovision of mechanism whereby a powerful movement willbe imparted tothe reciprocating element or elements and the direction of movement willbe automatically reversed at the end of a stroke. The stated object andsuch other objects as will incidentally appear from the followingdescription are attained in mechanism of the character illustrated inthe accompanying drawings and the invention resides in certain novelfeatures which will be particularly pointed out in the claims followingthe description.

In the accompanying drawings:

Figure 1 is a plan view of the preferred embodiment of the invention; I

Fig. 2 is a-vertical section taken on the line 22 of Fig. 1;

Fig. 3 is a longitudinal section taken on the line 33 of Fig. 1;

Fig. 4 is a detail section through the shifting bar;

Figs. 5 and 6 are respectively a plan and an elevation showing amodification;

Fig. 7 is a detail rear elevation; and

Fig. 8 is a detail perspective view of the reversing levers. b I Incarrying out my invention, I employ a supporting frame which may .be ofany preferred or convenient constructionand is provided with uprights 1sufficient in numher to provide bearings for all the shafts andmoving-parts. The motor shaft 2 is journaled in alined bearings disposedpreferably on the central transverse line of the supporting frame andthis driving shaft is equipped with a pulley 3 at its front or outer endto receive motion fromany convenient engine or prime motor. On the innerend of the shaft 2 is a beveled pinion 4 which is adapted to be engagedalternately by beveled gears 5 and 6 which are keyed upon the hollowdriven shaft 7 so that they may slide upon said shaft but are.constrained to rotate therewith. The said beveled gears 5 and 6 have acommon hub 8 formed with a central annular groove 9 engaged by pins 10on a yoke 11 formed on the inner or front end of a reversing lever 12.The said lever 12 isfulcrurned upon the supporting frame immediatelyadjacent the driven shaft 7 and between the gears 5 and (iso' that, whenthe lever is vibrated, the said gears will be moved longitudinally ofthe driven shaft and caused to alternately house them and be releasedfrom the beveled pinion 4. The hollow driven shaft 7 is inter- 'nallythreaded. at its opposite ends and the threads are of opposite pitchwhile in the said ends are mounted the plungers or reciprocating members13 and 14 which are externally threaded v so as to engage the internalthreads of the hollow shaft, as clearly shown in Fig. 3. These pistons,plungers or reciprocating members are constructed at their ends in anyconvenient manner so as to be coupled to the mechanism to be driven andit will be readily understood that they will be thereby held againstrotation so that, when the shaft 7 is rotated, the said members 13 and142 will be caused to move inwardly or outwardly relative to said shaftaccording to the direction of rotation of the same.

To one of the pistons or reciprocating members, the member 14 in thepresent illustration, I secure shifting bar 15 which has one end bentforwardlv so as to be swiveled or. otherwise connected with thereciprocatmg member and has its main portion slid- .ably mounted uponthe supporting frame parallel with the driven shaft. This reversing baris hollow and is constructedwith longitudinal slots 16 in its walls, asshown most clearly in Fig. 4, and the said slots receive the inner endof a primary reversing lever 17 which is fulcrumed upon'th-e supportingframe in rear of the reversing bar and has its outer end upturned, asshown at 18, to be pivoted to the secondary reversing lever 12, thefulcrums of the said levers l2 and 17 being respectively at the innerand the outer side of the reversingbar, as shown inFig. 1.- The slotsh16should be equal in length to the stroke of the piston and coiled springs18 are disposed within the reversing car at oppositefisides of the lever17, as

shown in Fig. 4. so as to cushion the movement of the said lever andpermit the same to remain relatively stationary until theworking springhas acquired a certain tension. Pins 01' other stops 19 are provided inthe reversing bar against the outer ends of the springs 18 and thesestops are adjustable so to regulate the tension at which the spring willbecome operative. The reversing lever 12 is provided in advance of itspivotal connection with the lever 17 with a slot 20 in which is receivedthe lower reduced end or tongue 21 of a weighted arm 22 fulcrumed uponthe supporting frame rotation of said shaft will cause the pistons '13and 14; to move outwardly 0r inwardly, as the case may be. The reversingbar 15, of course, follows the movement of the member to which it isconnected and as the parts approach the end of the stroke,'the spring 18which is being carried toward the reversing lever 17 will be graduallycompressed so that the reversing'bar 15 will move past the said leveruntil the spring has reached the tension previously calculated and forwhich it has been set as necessary to shift the lever. Assuming that thepinion 4 is in mesh with the gear 5, as illustrated in Fig. 1, thereciprocating or reversing .bar 15 will be moving toward the right. Asit approaches the limit of its stroke, the spring 18 at the left side ofthe lever 17 will be compressed and pressure exerted upon the innerendof said lever to swing it about its fulcrum so that the outer end of thelever will be moved to the left. This movement of the lever 17 will betransmitted directly to the lever 12 so that the inner end of said leverwill swing to the right and, consequently, the gear 5 will be moved outof engagement with the pinion i and the gear 6 moved into engagementwith the same whereupon the direction of 'rotation of the shaft will bereversed.

WVhen the outer end of the lever 12 swings to the left as justdescribed, the lower end of the weighted arm or lever 22 will belikewise swung to the left so that the weight 23 will be carried to aposition vertically over the fulcrum of the lever. The effort of thespring 18 to expand and the momentum of the weight will carry the weightbeyond the vertical position and, consequently, shift the parts to theopposite limit of their movement quickly so that the engagement of thegear 6 with the pinion 4 will be positive.

InfFigs. 5 and 6, I have illustrated the same mechanism applied to adriven shaft which is equipped with fast and loose pulleys upon whichdriving belts are run. In the said figures, 24 designates the drivenshaft, 25 the fast pulley thereon and 26 the loose pulleys. Two belts 27and 2-8, the latter being closed, are arranged to pass around thesepulleys and the driven shaft will rotate in one or the other directionaccordingly as the straight or crossed belt is in engagement with thefast pulley 25. In this form of the invention, the secondary reversinglever 29 is provided with a fork 30 at its inner end which is adapted toengage the belts and shift the same as the lever is vibrated, whichaction is caused in exactly the same manner as in the form ,previouslydescribed.

It will be readily notedthat the mechanism devised by me is very simpleand as screws are employed to impart movement to the reciprocatingmembers, great power is secured although movement is comparatively slow.This slow movement, however, facilitates the automatic reversing of thedirection of movement inasmuch as the reversing bar may move past theend of the primary reversing lever until the spring bearing upon thesaid lever reaches the desired tension whereupon the lever will bequickly shifted and the throw of the lever positively completed throughthe action of the weighted arm or pendulum. While 1 have illustrated tworeciprocating members, it will, of course, be obvious'that one of saidmembers may be omitted and other changes may be'made in the minordetails without involving a departure from the spirit or scope of theinvention as the same is defined in the appended claims.

Having, thus described the invention,

portion of the reversing bar, and a second lever having one end pivotedto the outer end of the first-mentioned lever and its opposite endarranged to shift the operative connection between the driving anddriven shafts. V

i 2. In mechanism of the character set forth, the combination of adriven shaft, a continuously rotating. driving shaft, operativeconnections between the driving and driven shafts, a reciprocatingmember actuated by'the driven shaft, a reversing bar carried by'thereciprocating member and provided with alongitudinal slot, a reversinglever having one end playing in said slot, yieldable members carried bythe reversing barand bearing against the opposite sides of the reversinglever, and a second lever having one end pivoted to the free end of thefirst-mentioned lever and its opposite end arranged to shift theoperative connections between the driving and driven shafts.

8. In mechanism of the character set forth, the combination of a drivenshaft, a continuously rotating driving shaft, opera ive connectionsbetween the driving and driven shafts, a reciprocating member actuatedby the driven shaft, a reversing bar carried by the reciprocatingmember, a reversing lever having one end disposed to be actuated by thereversing bar, a second lever having one end pivoted to the outer end ofthe first-mentioned lever and its opposits end arranged to shift theoperative connections between the driving and driven shafts, and meansfor accelerating the movement of the second lever.

' 4:. In a mechanism of the character set forth, the combination of adriven shaft, oppositely disposed gears on said shaft, a continuouslyrotating shaft disposed between the said gears, a reciprocating memberactuated by said driven shaft, a reversing bar carried by saidreciprocating member, a primary reversing lever having one end looselyengaged by the reversing bar, a secondary reversing lever fulcrumedbetween its ends and having its inner end connected with the gears on.the hollow shaft and its outer end pivoted to the outer end of thefirst-mentioned reversin lever and means whereby the movement of thereversing bar will actuate the primary lever. 5.-In a mechanism of thecharacter set forth, the combination of a driven shaft, a reciprocatingmember actuated by said shaft, oppositely disposed gears mounted on saidshaft, a continuously rotating driving shaft disposed between said gearsand equipped to mesh with either of the same, a

reversing bar carried by the reciprocating member and having alongitudinal slot, at primary reversing lever having its inner endfitted loosely in said slot, springs disposed within the reversing bar,and a secondary reversing lever pivoted near its outer end tothe outerend of the primary reversing lever and having its inner end connectedwith the gears on the driven shaft.

6. In a mechanism of the character set forth, the combination of adriven shaft,

oppositely disposed gears on said shaft, a

whereby the movement of the reversing bar will actuate the primaryreversing lever, and an arm fulcrumed above the secondary lever andhaving its lower end loosely engaging the same and provided with aweight above its fulcrum.

In testimony whereof, I affix my signature.

FRANKLIN D. SMITH. [L. s.]

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

